The U.S. state of Washington has six telephone area codes serving five geographically distinct numbering plan areas (NPAs). In 1947, the state was assigned a single area code (206) until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington.
In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington. In 1997, area code 425 was assigned to Seattle's Eastside and South Snohomish County suburbs and area code 253 for the Tacoma area, leaving 206 for just the city of Seattle, closely neighboring cities in King and Snohomish counties, and Bainbridge Island in Kitsap County.
Areacode Yearcreated ParentNPA Overlay Numbering plan area 206 1947 – 206/564 Seattle, Shoreline, Lake Forest Park, Mercer Island, Bainbridge Island, Vashon Island 360 1995 206 360/564 Western Washington excluding most of the Seattle metropolitan area; includes Olympia, Kitsap County, Bellingham, and Vancouver 564 2017 206 206/564 NPA 206 2023 360 360/564 NPA 360 253 1997 206 – Southern Puget Sound region, including Tacoma, most of Pierce County, Auburn, and Federal Way 425 1997 206 – Suburbs north and east of Seattle; Eastside and southern Snohomish County, including Everett, Snoqualmie Pass, and Renton 509 1957 206 – Eastern Washington, including Spokane, the Tri-Cities, Yakima, Walla Walla, and Wenatchee
See also
List of North American Numbering Plan area codes
References
External links NANPA Washington area code map